iMac running slow

Hello and welcome to the community 🤗

if your Mac is slow

If you find your Mac is running slowly, there are a number of potential causes that you can check.

• Your computer’s startup disk may not have enough free disk space. To make disk space available, you can move files to another disk or an external storage device, then delete files you no longer need on the startup disk. macOS can also help you optimize storage by storing files in the cloud and helping you identify files you no longer need.

• An app you’re using may require more memory than your Mac has easily available. To see how much memory your Mac has, choose Apple menu  > About This Mac, then check the amount of memory listed in the Overview pane. See the documentation that came with the app to find out its system requirements.

• To find out how to increase your computer’s memory, choose Apple menu  > About This Mac, click Memory, then click Memory Upgrade Instructions in the lower-right corner. (Not available on all computers.)

• Quit any app that isn’t compatible with your Mac. For example, an app may require a different processor or graphics card. See the documentation that came with the app for information about its system requirements.

• To see what processor your computer has, choose Apple menu  > About This Mac, then click Overview.

• To see what graphics card your computer has, choose Apple menu  > About This Mac, then click Displays. The name of the graphics card in your computer is displayed in the middle of the window.

• Quit any apps you’re not using.

• If you have problems with your disk, use Disk Utility to verify and try and fix any issues.

• Use Activity Monitor to see if a particular app or activity is making a large demand on your Mac.

• Source If your Mac runs slowly - Apple Support (CA)

For more help or questions

Come back us or contact Apple Support

Without any real information on your system I'd begin by doing the following:

It will help us get a good idea of what is causing your problem if you provide a report of your system, that way we do not have to play 20 questions with you. The report we are requesting does NOT provide any personal information and is extremely safe to use. Please navigate to www.Etrecheck.com and download the free version of EtreCheck. Once you have you downloaded the app and installed it, please run the report and save it. This report will help us get a good idea what has been installed on your system and help us be able to diagnose what may be wrong.

When you have your report, you can attach it when you reply to this message and we can then review it and help you determine what is needed to get your system running well again. 

For instructions on how to download your EtreCheck report and attach it to your reply to this message please click How to use the Add Text Feature When Post… - Apple Community

Hello!

+1 on running EtreCheck. EtreCheck provides valuable information on your Mac for easy troubleshooting.  

Jack